如何将mongodb中的数据保存到node.js缓存中？

const MongoClient = require('mongodb').MongoClient;
const redis = require('redis');

// MongoDB 连接配置
const mongoUrl = 'mongodb://localhost:27017';
const dbName = 'mydb';
const collectionName = 'mycollection';

// Redis 连接配置
const redisClient = redis.createClient();

// 连接 MongoDB
MongoClient.connect(mongoUrl, (err, client) => {
  if (err) {
    console.error('Failed to connect to MongoDB:', err);
    return;
  }

  console.log('Connected to MongoDB');

  const db = client.db(dbName);
  const collection = db.collection(collectionName);

  // 查询数据
  collection.find({}).toArray((err, result) => {
    if (err) {
      console.error('Failed to fetch data from MongoDB:', err);
      return;
    }

    console.log('Fetched data from MongoDB:', result);

    // 将数据保存到 Redis 缓存中
    redisClient.set('mydata', JSON.stringify(result), (err) => {
      if (err) {
        console.error('Failed to save data to Redis:', err);
        return;
      }

      console.log('Data saved to Redis');
      redisClient.quit();
      client.close();
    });
  });
});